Added auth mechanism for Nailgan API client.

Change-Id: I179ee6a787f037bd2cd97807700d736eab21a318
Disable invocation of heat tests in savanna deploy

Change execution of all platform tests
for invocation savanna specific tests only

Change-Id: I088acdce5243d65cc8b3f4132fad52b7647b9663
Closes-bug: #1273674
Merge "Added auth mechanism for Nailgan API client."
Cold restart for HA environment

* There were warm restart tests so far.
It renames restart_nodes method to warm_restart_nodes
and adds real cold restart to HA test
* Move warm / cold restart tests to seperate package.
So that all new non-functional tests (for HA mode
in most cases) will be stored there.

Change-Id: I7b18129b75c52ee1ea0b80c2419f95e87667cfb7